CustomAgoraViewController.swift

extension CustomAgoraViewController: UITextFieldDelegate {
   func addMessage(user: String, message: String) {
       let message = "\(user): \(message)"
       messageList.append(message)
       let indexPath = IndexPath(row: self.messageList.count-1, section: 0)
       self.chatTableView.insertRows(at: [indexPath], with: UITableView.RowAnimation.automatic)
       self.chatTableView.scrollToRow(at: indexPath, at: .bottom, animated: true)
   }


   func textFieldShouldReturn(_ textField: UITextField) -> Bool {
       if let text = textField.text, text != "" {
           rtmChannel?.send(AgoraRtmMessage(text: text), completion: { (error) in
               if error != .errorOk {
                   print("Failed to send message: ", error)
               } else {
                   self.addMessage(user: self.currentUser!.displayName ?? self.currentUser!.uid, message: text)
               }
           })
           textField.text = ""
       }
       return true
   }
}


extension CustomAgoraViewController: AgoraRtmChannelDelegate {
   func channel(_ channel: AgoraRtmChannel, messageReceived message: AgoraRtmMessage, from member: AgoraRtmMember) {
       addMessage(user: member.userId, message: message.text)
   }
}